Is 635 E 21st St rent stabilized?
635 E 21st St is a registered NYC rent-stabilized building in Flatbush, Brooklyn (11226). It has about 39 apartments, built in 1935.
Also written as 635 East 21st Street — or 635 E 21st St, Brooklyn, NY 11226.
How this building compares
With about 39 apartments it sits near the middle of the 564 rent-stabilized buildings this site tracks in Flatbush, where the median building has 35. Its 1935 construction date sits close to the 1931 median for stabilized buildings tracked in the neighborhood. HPD lists 17 open violations here, about one for every 2 apartments — below the 0.9 per apartment median for tracked buildings in the neighborhood. Of the 170 violations on record at the address, 26 are class C — HPD's immediately hazardous grade. Tenants have filed 524 HPD complaints at the address, 3 of them in the last twelve months.
Building details
| Borough | Brooklyn |
| Neighborhood | Flatbush |
| ZIP | 11226 |
| Year built | 1935 |
| Apartments | 39 |
| Rent-stabilized | Yes — DHCR registered |
| Stabilization code | MULTIPLE DWELLING A |
| BBL | 3052070040 |
Owner & management
| Owner | 635, LLC 57 FIFTH AVENUE #1 · BROOKLYN, NY 11217 |
| Managing agent | ISMAEL RIOJA |
Building conditions
| HPD violations | 17 open / 170 total |
| HPD complaints | 3 open / 524 total |
| HPD registration last filed | September 13, 2025 |